Effect of hole geometry on charge sharing and other parameters in GEM-based detectors

Abstract

Gas Electron Multipliers (GEM) are among the more prominent Micro-Pattern Gaseous Detectors (MPGDs) and widely used in high energy particle physics experiments and various related applications. Adoption of different production techniques lead to holes of varying geometries in GEM foils. Since the response of a GEM-based detector is closely related to the hole geometry through the influence of the latter on charge sharing and transport through GEM foils, attempts have been made to relate hole configurations to different figures of merit of a detector. Numerical simulations have been performed to study the effects of hole geometry on important parameters such as charge sharing, collection efficiency, extraction efficiency, gain, possibility of transition from avalanche to streamer modes for single, double and triple layer GEM detectors. The numerical estimates have been compared to available experimental data. The comparisons, although not always in agreement, are found to be generally encouraging.

19 pages, 18 figures, preprint prepared for JINST. v3 was an incorrect replacement and this reverts to the latest correct version V2

References in corpus (7)

• Progress on large area GEMs (VCI 2010)
• Simulation of Three Dimensional Electrostatic Field Configuration in Wire Chambers : A Novel Approach
• Research on discharges in micropattern and small gap gaseous detectors
• 3D Simulation of Electron and Ion Transmission of GEM-based Detectors
• Numerical estimation of discharge probability in GEM-based detectors
• Impact of the hole orientation of asymmetric GEM foils on the performance of single and triple GEM detectors
• Hole Misalignment and Gain Performance of Gaseous Electron Multipliers

Cited by in corpus (1)

• Study of space charge phenomena in GEM-based detectors